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Elastic wave-based non-destructive testing(NDT) methods are effective for flaw detection in concrete structures and pavements.However,the test speed of elastic wave-based methods is severely limited by the physical coupling between sensors and concrete surface.The air-coupled sensing method is proposed as a solution to develop rapid NDT techniques for concrete infrastructure.This paper reviews the development of air-coupled sensing technique for concrete structures in civil engineering applications.It presents four stages of the research:1) feasibility study through theoretical analysis;2) air-coupled surface wave velocity measurement; 3) air-coupled surface wave transmission measurement to determine crack depth;4) air-coupled impact -echo test to locate delaminations and voids in concrete.
Elastic wave-based non-destructive testing (NDT) methods are effective for flaw detection in concrete structures and pavements. However, the test speed of elastic wave-based methods is severely limited by the physical coupling between sensors and concrete surfaces. Air- coupled sensing method is proposed as a solution to develop rapid NDT techniques for concrete infrastructure. This paper reviews the development of air-coupled sensing technique for concrete structures in civil engineering applications. It presents four stages of the research: 1) feasibility study through theoretical air-coupled surface wave transmission measurement to determine crack depth; 4) air-coupled impact -echo test to locate delaminations and voids in concrete.